Yesterday I stumbled upon a very promising framework for iOS devices (iPhone|iPod Touch|iPad).
Very elegantly designed, if you know Flash, Java, and/or C# you may feel very comfortable with it. Of course, one still needs to understand the Objective-C no matter what!
I like it a lot, I will play with it more and give updates accordingly!
Here is the ULR: http://www.sparrow-framework.org/